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一、查询表主键列
select column_name from dba_cons_columns where constraint_name in (select constraint_name from dba_constraints where table_name = upper('tablename') and constraint_type = 'P');
二、查询表外键列
select column_name from dba_cons_columns where constraint_name in (select constraint_name from dba_constraints where table_name = upper('tablename') and constraint_type = 'R');
三、查询表中列
select column_name from dba_tab_columns where table_name = upper('tablename');
四、查询表之间的主外键关系
select b.table_name 主键表名, b.column_name 主键列名, a.table_name 外键表名, a.column_name 外键列名 from (select a.constraint_name, b.table_name, b.column_name, a.r_constraint_name from dba_constraints a, dba_cons_columns b WHERE a.constraint_type = 'R' and a.constraint_name = b.constraint_name) a, (select distinct a.r_constraint_name, b.table_name, b.column_name from dba_constraints a, dba_cons_columns b WHERE a.constraint_type = 'R' and a.r_constraint_name = b.constraint_name) b where a.r_constraint_name = b.r_constraint_name;